2 * fs/partitions/check.c
4 * Code extracted from drivers/block/genhd.c
5 * Copyright (C) 1991-1998 Linus Torvalds
6 * Re-organised Feb 1998 Russell King
8 * We now have independent partition support from the
9 * block drivers, which allows all the partition code to
10 * be grouped in one location, and it to be mostly self
13 * Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl}
16 #include <linux/init.h>
17 #include <linux/module.h>
19 #include <linux/kmod.h>
20 #include <linux/ctype.h>
21 #include <linux/genhd.h>
22 #include <linux/blktrace_api.h>
41 #ifdef CONFIG_BLK_DEV_MD
42 extern void md_autodetect_dev(dev_t dev);
45 int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
47 static int (*check_part[])(struct parsed_partitions *, struct block_device *) = {
49 * Probe partition formats with tables at disk address 0
50 * that also have an ADFS boot block at 0xdc0.
52 #ifdef CONFIG_ACORN_PARTITION_ICS
55 #ifdef CONFIG_ACORN_PARTITION_POWERTEC
56 adfspart_check_POWERTEC,
58 #ifdef CONFIG_ACORN_PARTITION_EESOX
63 * Now move on to formats that only have partition info at
64 * disk address 0xdc0. Since these may also have stale
65 * PC/BIOS partition tables, they need to come before
68 #ifdef CONFIG_ACORN_PARTITION_CUMANA
69 adfspart_check_CUMANA,
71 #ifdef CONFIG_ACORN_PARTITION_ADFS
75 #ifdef CONFIG_EFI_PARTITION
76 efi_partition, /* this must come before msdos */
78 #ifdef CONFIG_SGI_PARTITION
81 #ifdef CONFIG_LDM_PARTITION
82 ldm_partition, /* this must come before msdos */
84 #ifdef CONFIG_MSDOS_PARTITION
87 #ifdef CONFIG_OSF_PARTITION
90 #ifdef CONFIG_SUN_PARTITION
93 #ifdef CONFIG_AMIGA_PARTITION
96 #ifdef CONFIG_ATARI_PARTITION
99 #ifdef CONFIG_MAC_PARTITION
102 #ifdef CONFIG_ULTRIX_PARTITION
105 #ifdef CONFIG_IBM_PARTITION
108 #ifdef CONFIG_KARMA_PARTITION
111 #ifdef CONFIG_SYSV68_PARTITION
118 * disk_name() is used by partition check code and the genhd driver.
119 * It formats the devicename of the indicated disk into
120 * the supplied buffer (of size at least 32), and returns
121 * a pointer to that same buffer (for convenience).
124 char *disk_name(struct gendisk *hd, int partno, char *buf)
127 snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
128 else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
129 snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);
131 snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
136 const char *bdevname(struct block_device *bdev, char *buf)
138 return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
141 EXPORT_SYMBOL(bdevname);
144 * There's very little reason to use this, you should really
145 * have a struct block_device just about everywhere and use
146 * bdevname() instead.
148 const char *__bdevname(dev_t dev, char *buffer)
150 scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
151 MAJOR(dev), MINOR(dev));
155 EXPORT_SYMBOL(__bdevname);
157 static struct parsed_partitions *
158 check_partition(struct gendisk *hd, struct block_device *bdev)
160 struct parsed_partitions *state;
163 state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
167 disk_name(hd, 0, state->name);
168 printk(KERN_INFO " %s:", state->name);
169 if (isdigit(state->name[strlen(state->name)-1]))
170 sprintf(state->name, "p");
172 state->limit = disk_max_parts(hd);
174 while (!res && check_part[i]) {
175 memset(&state->parts, 0, sizeof(state->parts));
176 res = check_part[i++](state, bdev);
178 /* We have hit an I/O error which we don't report now.
179 * But record it, and let the others do their job.
189 /* The partition is unrecognized. So report I/O errors if there were any */
192 printk(" unknown partition table\n");
193 else if (warn_no_part)
194 printk(" unable to read partition table\n");
199 static ssize_t part_partition_show(struct device *dev,
200 struct device_attribute *attr, char *buf)
202 struct hd_struct *p = dev_to_part(dev);
204 return sprintf(buf, "%d\n", p->partno);
207 static ssize_t part_start_show(struct device *dev,
208 struct device_attribute *attr, char *buf)
210 struct hd_struct *p = dev_to_part(dev);
212 return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
215 ssize_t part_size_show(struct device *dev,
216 struct device_attribute *attr, char *buf)
218 struct hd_struct *p = dev_to_part(dev);
219 return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
222 ssize_t part_alignment_offset_show(struct device *dev,
223 struct device_attribute *attr, char *buf)
225 struct hd_struct *p = dev_to_part(dev);
226 return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset);
229 ssize_t part_discard_alignment_show(struct device *dev,
230 struct device_attribute *attr, char *buf)
232 struct hd_struct *p = dev_to_part(dev);
233 return sprintf(buf, "%u\n", p->discard_alignment);
236 ssize_t part_stat_show(struct device *dev,
237 struct device_attribute *attr, char *buf)
239 struct hd_struct *p = dev_to_part(dev);
242 cpu = part_stat_lock();
243 part_round_stats(cpu, p);
246 "%8lu %8lu %8llu %8u "
247 "%8lu %8lu %8llu %8u "
250 part_stat_read(p, ios[READ]),
251 part_stat_read(p, merges[READ]),
252 (unsigned long long)part_stat_read(p, sectors[READ]),
253 jiffies_to_msecs(part_stat_read(p, ticks[READ])),
254 part_stat_read(p, ios[WRITE]),
255 part_stat_read(p, merges[WRITE]),
256 (unsigned long long)part_stat_read(p, sectors[WRITE]),
257 jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
259 jiffies_to_msecs(part_stat_read(p, io_ticks)),
260 jiffies_to_msecs(part_stat_read(p, time_in_queue)));
263 ssize_t part_inflight_show(struct device *dev,
264 struct device_attribute *attr, char *buf)
266 struct hd_struct *p = dev_to_part(dev);
268 return sprintf(buf, "%8u %8u\n", p->in_flight[0], p->in_flight[1]);
271 #ifdef CONFIG_FAIL_MAKE_REQUEST
272 ssize_t part_fail_show(struct device *dev,
273 struct device_attribute *attr, char *buf)
275 struct hd_struct *p = dev_to_part(dev);
277 return sprintf(buf, "%d\n", p->make_it_fail);
280 ssize_t part_fail_store(struct device *dev,
281 struct device_attribute *attr,
282 const char *buf, size_t count)
284 struct hd_struct *p = dev_to_part(dev);
287 if (count > 0 && sscanf(buf, "%d", &i) > 0)
288 p->make_it_fail = (i == 0) ? 0 : 1;
294 static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
295 static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
296 static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
297 static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
298 static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show,
300 static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
301 static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL);
302 #ifdef CONFIG_FAIL_MAKE_REQUEST
303 static struct device_attribute dev_attr_fail =
304 __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
307 static struct attribute *part_attrs[] = {
308 &dev_attr_partition.attr,
309 &dev_attr_start.attr,
311 &dev_attr_alignment_offset.attr,
312 &dev_attr_discard_alignment.attr,
314 &dev_attr_inflight.attr,
315 #ifdef CONFIG_FAIL_MAKE_REQUEST
321 static struct attribute_group part_attr_group = {
325 static const struct attribute_group *part_attr_groups[] = {
327 #ifdef CONFIG_BLK_DEV_IO_TRACE
328 &blk_trace_attr_group,
333 static void part_release(struct device *dev)
335 struct hd_struct *p = dev_to_part(dev);
340 struct device_type part_type = {
342 .groups = part_attr_groups,
343 .release = part_release,
346 static void delete_partition_rcu_cb(struct rcu_head *head)
348 struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
350 part->start_sect = 0;
352 part_stat_set_all(part, 0);
353 put_device(part_to_dev(part));
356 void delete_partition(struct gendisk *disk, int partno)
358 struct disk_part_tbl *ptbl = disk->part_tbl;
359 struct hd_struct *part;
361 if (partno >= ptbl->len)
364 part = ptbl->part[partno];
368 blk_free_devt(part_devt(part));
369 rcu_assign_pointer(ptbl->part[partno], NULL);
370 rcu_assign_pointer(ptbl->last_lookup, NULL);
371 kobject_put(part->holder_dir);
372 device_del(part_to_dev(part));
374 call_rcu(&part->rcu_head, delete_partition_rcu_cb);
377 static ssize_t whole_disk_show(struct device *dev,
378 struct device_attribute *attr, char *buf)
382 static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
383 whole_disk_show, NULL);
385 struct hd_struct *add_partition(struct gendisk *disk, int partno,
386 sector_t start, sector_t len, int flags)
389 dev_t devt = MKDEV(0, 0);
390 struct device *ddev = disk_to_dev(disk);
392 struct disk_part_tbl *ptbl;
396 err = disk_expand_part_tbl(disk, partno);
399 ptbl = disk->part_tbl;
401 if (ptbl->part[partno])
402 return ERR_PTR(-EBUSY);
404 p = kzalloc(sizeof(*p), GFP_KERNEL);
406 return ERR_PTR(-EBUSY);
408 if (!init_part_stats(p)) {
412 pdev = part_to_dev(p);
414 p->start_sect = start;
415 p->alignment_offset = queue_sector_alignment_offset(disk->queue, start);
416 p->discard_alignment = queue_sector_discard_alignment(disk->queue,
420 p->policy = get_disk_ro(disk);
422 dname = dev_name(ddev);
423 if (isdigit(dname[strlen(dname) - 1]))
424 dev_set_name(pdev, "%sp%d", dname, partno);
426 dev_set_name(pdev, "%s%d", dname, partno);
428 device_initialize(pdev);
429 pdev->class = &block_class;
430 pdev->type = &part_type;
433 err = blk_alloc_devt(p, &devt);
438 /* delay uevent until 'holders' subdir is created */
439 dev_set_uevent_suppress(pdev, 1);
440 err = device_add(pdev);
445 p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
449 dev_set_uevent_suppress(pdev, 0);
450 if (flags & ADDPART_FLAG_WHOLEDISK) {
451 err = device_create_file(pdev, &dev_attr_whole_disk);
456 /* everything is up and running, commence */
457 INIT_RCU_HEAD(&p->rcu_head);
458 rcu_assign_pointer(ptbl->part[partno], p);
460 /* suppress uevent if the disk supresses it */
461 if (!dev_get_uevent_suppress(ddev))
462 kobject_uevent(&pdev->kobj, KOBJ_ADD);
472 kobject_put(p->holder_dir);
480 /* Not exported, helper to add_disk(). */
481 void register_disk(struct gendisk *disk)
483 struct device *ddev = disk_to_dev(disk);
484 struct block_device *bdev;
485 struct disk_part_iter piter;
486 struct hd_struct *part;
489 ddev->parent = disk->driverfs_dev;
491 dev_set_name(ddev, disk->disk_name);
493 /* delay uevents, until we scanned partition table */
494 dev_set_uevent_suppress(ddev, 1);
496 if (device_add(ddev))
498 #ifndef CONFIG_SYSFS_DEPRECATED
499 err = sysfs_create_link(block_depr, &ddev->kobj,
500 kobject_name(&ddev->kobj));
506 disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
507 disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
509 /* No minors to use for partitions */
510 if (!disk_partitionable(disk))
513 /* No such device (e.g., media were just removed) */
514 if (!get_capacity(disk))
517 bdev = bdget_disk(disk, 0);
521 bdev->bd_invalidated = 1;
522 err = blkdev_get(bdev, FMODE_READ);
525 blkdev_put(bdev, FMODE_READ);
528 /* announce disk after possible partitions are created */
529 dev_set_uevent_suppress(ddev, 0);
530 kobject_uevent(&ddev->kobj, KOBJ_ADD);
532 /* announce possible partitions */
533 disk_part_iter_init(&piter, disk, 0);
534 while ((part = disk_part_iter_next(&piter)))
535 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
536 disk_part_iter_exit(&piter);
539 int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
541 struct disk_part_iter piter;
542 struct hd_struct *part;
543 struct parsed_partitions *state;
546 if (bdev->bd_part_count)
548 res = invalidate_partition(disk, 0);
552 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
553 while ((part = disk_part_iter_next(&piter)))
554 delete_partition(disk, part->partno);
555 disk_part_iter_exit(&piter);
557 if (disk->fops->revalidate_disk)
558 disk->fops->revalidate_disk(disk);
559 check_disk_size_change(disk, bdev);
560 bdev->bd_invalidated = 0;
561 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
563 if (IS_ERR(state)) /* I/O error reading the partition table */
566 /* tell userspace that the media / partition table may have changed */
567 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
569 /* Detect the highest partition number and preallocate
570 * disk->part_tbl. This is an optimization and not strictly
573 for (p = 1, highest = 0; p < state->limit; p++)
574 if (state->parts[p].size)
577 disk_expand_part_tbl(disk, highest);
580 for (p = 1; p < state->limit; p++) {
583 size = state->parts[p].size;
587 from = state->parts[p].from;
588 if (from >= get_capacity(disk)) {
590 "%s: p%d ignored, start %llu is behind the end of the disk\n",
591 disk->disk_name, p, (unsigned long long) from);
595 if (from + size > get_capacity(disk)) {
596 const struct block_device_operations *bdops = disk->fops;
597 unsigned long long capacity;
600 "%s: p%d size %llu exceeds device capacity, ",
601 disk->disk_name, p, (unsigned long long) size);
603 if (bdops->set_capacity &&
604 (disk->flags & GENHD_FL_NATIVE_CAPACITY) == 0) {
605 printk(KERN_CONT "enabling native capacity\n");
606 capacity = bdops->set_capacity(disk, ~0ULL);
607 disk->flags |= GENHD_FL_NATIVE_CAPACITY;
608 if (capacity > get_capacity(disk)) {
609 set_capacity(disk, capacity);
610 check_disk_size_change(disk, bdev);
611 bdev->bd_invalidated = 0;
616 * we can not ignore partitions of broken tables
617 * created by for example camera firmware, but
618 * we limit them to the end of the disk to avoid
619 * creating invalid block devices
621 printk(KERN_CONT "limited to end of disk\n");
622 size = get_capacity(disk) - from;
625 part = add_partition(disk, p, from, size,
626 state->parts[p].flags);
628 printk(KERN_ERR " %s: p%d could not be added: %ld\n",
629 disk->disk_name, p, -PTR_ERR(part));
632 #ifdef CONFIG_BLK_DEV_MD
633 if (state->parts[p].flags & ADDPART_FLAG_RAID)
634 md_autodetect_dev(part_to_dev(part)->devt);
641 unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
643 struct address_space *mapping = bdev->bd_inode->i_mapping;
646 page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
652 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
654 page_cache_release(page);
660 EXPORT_SYMBOL(read_dev_sector);
662 void del_gendisk(struct gendisk *disk)
664 struct disk_part_iter piter;
665 struct hd_struct *part;
667 /* invalidate stuff */
668 disk_part_iter_init(&piter, disk,
669 DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
670 while ((part = disk_part_iter_next(&piter))) {
671 invalidate_partition(disk, part->partno);
672 delete_partition(disk, part->partno);
674 disk_part_iter_exit(&piter);
676 invalidate_partition(disk, 0);
677 blk_free_devt(disk_to_dev(disk)->devt);
678 set_capacity(disk, 0);
679 disk->flags &= ~GENHD_FL_UP;
680 unlink_gendisk(disk);
681 part_stat_set_all(&disk->part0, 0);
682 disk->part0.stamp = 0;
684 kobject_put(disk->part0.holder_dir);
685 kobject_put(disk->slave_dir);
686 disk->driverfs_dev = NULL;
687 #ifndef CONFIG_SYSFS_DEPRECATED
688 sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
690 device_del(disk_to_dev(disk));